process-util: debug log if PR_SET_NAME fails.

diff --git a/src/basic/process-util.c b/src/basic/process-util.c
index 2516730a8ac560d515645788581de04221591163..05373689eaa5d474e55fb98a0bef4da94da1eec2 100644 (file)
--- a/src/basic/process-util.c
+++ b/src/basic/process-util.c
@@ -304,8 +304,10 @@ int rename_process(const char name[]) {
 
         l = strlen(name);
 
-        /* First step, change the comm field. */
-        (void) prctl(PR_SET_NAME, name);
+        /* First step, change the comm field. The main thread's comm is identical to the process comm. This means we
+         * can use PR_SET_NAME, which sets the thread name for the calling thread. */
+        if (prctl(PR_SET_NAME, name) < 0)
+                log_debug_errno(errno, "PR_SET_NAME failed: %m");
         if (l > 15) /* Linux process names can be 15 chars at max */
                 truncated = true;